EIL, welcome to the forum, lotsa good info here.
I used black enamel from ACE hardware. The TRA judging manual specifies black. However it's your car so if you want to paint it flaming red then by all means do so. I'm a "do it like it came out of the factory" kind of guy, but that's me.
Good luck and keep us posted. Pictures, lotsa pictures are real good.
Cheers, Tinkerman